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  <h1 class="title">简介</h1>
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   With the exif extension you are able to work with image meta data.  For
   example, you may use exif functions to read meta data of pictures taken 
   from digital cameras by working with information stored in the headers of 
   the <acronym title="Joint Photographic Experts Group">JPEG</acronym> and <acronym title="Tagged Image File Format">TIFF</acronym> images.
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